Priests can help to protect themselves and their group members Maple Story Mesos from caster mobs who fire shadow bolts and the like. Shadow damage usually appears purplish. If you're unsure, check your combat log to discover the damage type. Thorns- Druids should limit this buff to melee classes who fight in close proximity to mobs. It causes a small amount of damage to nearby attackers. As the primary healer, it's not necessary to cast this buff on yourself.